Flowing oil production integrated pipe column

Abstract

The invention relates to a flowing oil production integrated pipe column which comprises an oil pipe, a sucker rod is inserted into the oil pipe, an injection and production combined pump is arranged at the lower end of the oil pipe, a liquid inlet of the injection and production combined pump is connected with a paraffin and scale prevention device, and the lower end of the paraffin and scale prevention device is connected with a horn mouth through the oil pipe. According to the equipment provided by the embodiment of the invention, by predicting and analyzing the wellbore temperature field and the blowout stopping pressure under different pipe column combination conditions, a proper well completion pipe column combination is optimized, the wellhead temperature is increased to the maximum extent, and the blowout period is prolonged to the maximum extent; after oil well fracturing, well closing and plug drilling, the oil pipe is directly put into an oil pipe to serve as a production pipe column for self-spraying production, the inner diameter of a shaft pipe column is small, the liquid flow speed is high, the temperature loss of output liquid can be reduced, the shaft fluid temperature is increased, wax precipitation is prevented, meanwhile, the wellhead pressure drop speed can be reduced, and accumulated oil production per unit pressure drop is increased; after an oil well stops spraying, an oil well pump plunger and a pump rod are directly put down for production, well completion pipe string lifting operation is not needed, and the operation cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas production in the petroleum industry, and in particular to an integrated self-flowing oil production string. Background Art

[0002] Some oil wells in the oil field have the characteristics of high condensation and high wax content. The wax needs to be cleaned frequently during the production process, which can easily affect the production time of the oil wells. The casing self-flowing production is adopted, and the wellhead pressure of some oil wells drops rapidly, and the oil well self-flowing period is short. After the oil well stops flowing, it needs to be washed and pressured before the completion string and pump rod are lowered and put into production, which can easily cause reservoir damage.

[0003] How to extend the oil well self-flowing period and delay the wax deposition in the wellbore, while meeting the demand of pumping and putting into production directly after stopping the flow. According to the survey, domestic oil wells are currently produced by casing self-flowing, and the wax removal method mainly adopts hot washing or mechanical wax removal. After stopping the flow, the completion string and pump rod are put into production. Therefore, we proposed a self-flowing oil production integrated string. Summary of the invention

[0004] The present application provides a self-flowing oil production integrated pipe string to solve the problem in the prior art of how to prolong the self-flowing period of the oil well and delay wax deposition in the wellbore, while meeting the need to directly pump down and put into production after stopping the flow.

[0005] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a self-flowing oil production integrated pipe string, comprising:

[0006] An oil pipe, wherein a sucker rod is inserted into the interior of the oil pipe, a shooting and production combined pump is arranged at the lower end of the oil pipe, a wax and scale prevention device is connected to the liquid inlet of the shooting and production combined pump, and a bell mouth is connected to the lower end of the wax and scale prevention device through the oil pipe.

[0007] Optionally, the oil pipe is a thickened oil pipe with set inner diameter and outer diameter.

[0008] Optionally, the sucker rod adopts a thickened lined oil pipe with set inner diameter and outer diameter.

[0009] Optionally, the combined shooting and production pump adopts a pump barrel of a wellbore pump with a set outer diameter.

[0010] Optionally, the anti-wax and anti-scaling device adopts an anti-wax and anti-scaling device with a set length and diameter.

[0011] Optionally, the oil pipe between the anti-wax and anti-scale device and the bell mouth is a flat oil pipe with a set length and outer diameter.

[0012] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0013] The equipment provided in the embodiment of the present application predicts and analyzes the wellbore temperature field and stop-blowing pressure under different tubing combination conditions, and selects a suitable completion tubing combination to maximize the wellhead temperature and extend the self-blowing period; after the oil well is fracturing, the well is blocked, and the plug is drilled, the oil pipe is directly lowered into the production tubing for self-blowing production. The wellbore tubing has a small inner diameter and a high liquid flow rate, which can reduce the temperature loss of the produced fluid, increase the wellbore fluid temperature to prevent wax deposition, and at the same time reduce the wellhead pressure drop rate, increase the cumulative oil production per unit pressure drop, and improve the development efficiency; after the oil well stops blowing, the oil pump plunger and pump rod are directly lowered into production, without the need to lift and lower the completion tubing, thereby reducing the operating cost; at the same time, based on the anti-wax device, the frequency of wax cleaning operations can be effectively reduced, further reducing production costs and improving production time efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 The overall structure diagram of a self-flowing oil production integrated pipe string.

[0017] In the figure: 1. Sucker rod; 2. Oil pipe; 3. Jet-production combined pump; 4. Anti-wax and anti-scaling device; 5. Bell mouth. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0019] Various embodiments of the present application may exist in the form of a range. It should be understood that the description in the form of a range is only for convenience and simplicity and should not be understood as a hard limit to the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values ​​within the range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which are applicable regardless of the range. In addition, whenever a numerical range is indicated in the present application, it is meant to include any quoted numbers (fractions or integers) within the indicated range. Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present application, etc., can be purchased from the market or can be prepared by existing methods.

[0020] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the present application, the terms "include", "comprise", etc. refer to "including but not limited to". In the present application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In the present application, "and / or" describes the association relationship of the associated objects, indicating that three relationships may exist, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In the present application, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular items or plural items. For example, "at least one of a, b, or c" or "at least one of a, b and c" can both mean: a, b, c, ab, i.e. a and b, ac, bc or abc, where a, b, c can be single or plural, respectively.

[0021] like Figure 1 As shown, the embodiment of the present application provides a self-flowing oil production integrated pipe string, which is characterized by comprising:

[0022] An oil pipe 2, wherein a sucker rod 1 is inserted into the interior of the oil pipe 2, a shooting and production combined pump 3 is provided at the lower end of the oil pipe 2, a liquid inlet of the shooting and production combined pump 3 is connected to an anti-wax and anti-scale device 4, and the lower end of the anti-wax and anti-scale device 4 is connected to a bell mouth 5 through the oil pipe.

[0023] The oil pipe 2 is a thickened oil pipe with set inner and outer diameters.

[0024] The sucker rod 1 adopts a thickened inner lining oil pipe with set inner and outer diameters.

[0025] The shooting and production combined pump 3 adopts a pump barrel of a wellbore pump with a set outer diameter.

[0026] The anti-wax and anti-scaling device 4 is a wax and anti-scaling device with a set length and diameter.

[0027] The oil pipe between the anti-wax and anti-scaling device 4 and the bell mouth 5 is a flat oil pipe with a set length and outer diameter.

[0028] The steps to implement the program are as follows:

[0029] Step S101: preliminarily determine the depth of the completion string and the available completion string combination according to the buried depth of the oil reservoir;

[0030] Step S102: using a mathematical model or analysis software to calculate the wellhead produced fluid temperature and stop-flow pressure corresponding to the four schemes, and preliminarily determining a better completion string combination;

[0031] Step S103: predicting the daily fluid production of the oil well after stopping spraying and switching to pumping, and determining the appropriate pump diameter and pump barrel depth;

[0032] Step S104: determining the wax precipitation point location according to the wax precipitation point temperature of the crude oil and the temperature field distribution of the produced fluid along the wellbore;

[0033] Step S105: determining the specifications and models of the wellbore completion string, the depth, and the optimization of the location of the anti-wax and anti-scaling device;

[0034] Step S106: optimizing the combination of completion strings and checking their strength;

[0035] Step S107: Perform a one-time comparative analysis to optimally determine the completion string.

[0036] There are two solutions for optimizing the combination and strength verification of completion strings:

[0037] Type 1: Φ60.3mm thickened oil pipe * 500m + Φ60.3mm thickened lined oil pipe * 1700m + Φ44mm oil well pump barrel + anti-wax and anti-scaling device * 2210m + Φ60.3mm flat oil pipe * 1290m

[0038] The second type: Φ73mm thickened oil pipe * 500m + Φ73mm thickened lined oil pipe * 1700m + Φ44mm oil pump barrel + anti-wax and anti-scaling device * 2210m + Φ60.3mm flat oil pipe * 1290m

[0039] Example: Preliminary determination of the depth of the completion string and the available completion string combination based on the reservoir burial depth

[0040] Taking the X1 well in Dagang Oilfield as an example, the reservoir is 4050m deep. Based on the principle of going deeper, the completion string depth is determined to be 3500m. At the same time, according to the specifications of the existing oil pipes, the completion string combination is preliminarily determined as follows:

[0041] Solution 1: Φ73mm oil pipe (inner diameter 62mm);

[0042] Solution 2: Φ73mm lined oil pipe (inner diameter 53mm);

[0043] Solution 3: Φ60.3mm oil pipe (inner diameter 50.3mm);

[0044] Solution 4: Φ73mm lined oil pipe (inner diameter 53mm) and Φ60.3mm (inner diameter 50.3mm);

[0045] Step S102: using a mathematical model or analysis software to calculate the wellhead produced fluid temperature and stop-flow pressure corresponding to the four schemes, and preliminarily determining a better completion string combination;

[0046] For example, based on the daily fluid production of Well X1 of 45m 3 The wellbore completion string is 3500m deep. The wellbore temperature field and stop-blowing pressure analysis software are used to calculate the wellhead produced fluid temperature and stop-blowing pressure corresponding to the four schemes. Through analysis and comparison, the wellhead temperature and stop-blowing pressure of Scheme 3 and Scheme 4 are better.

[0047] Analytical Indicators Solution 1 Solution 2 Solution 3 Solution 4 Wellhead temperature (℃) 42.3 43.5 44.8 44.0 Stop spraying pressure (MPa) 30.0 29.4 28.0 28.7

[0048] Step S103: predicting the daily fluid production of the oil well after stopping spraying and switching to pumping, and determining the appropriate pump diameter and pump barrel depth;

[0049] For example, based on the production prediction model when the spraying stops and the average initial production of the pump in the same block as Well X, it is predicted that the daily production of Well X1 when the spraying stops is 32m3. 3 Based on the principle of deep pumping with a small pump, the pump diameter is determined to be 44mm. When the stroke frequency is 6m / 3 times / min, the theoretical displacement is 39.4m 3 / d, pump barrel depth 2200m.

[0050] Step S104: determining the wax precipitation point location according to the wax precipitation point temperature of the crude oil and the temperature field distribution of the produced fluid along the wellbore;

[0051] For example, according to the test results, the wax precipitation point temperature of well X1 is 45℃. Using the wellbore temperature field calculation model or analysis software, the daily production of 45m 3 The temperature field distribution of the produced fluid along the wellbore under the condition of / d showed that the temperature of the produced fluid at the wellbore 366m away from the wellhead was 45℃, that is, the wax precipitation point was determined to be 366m away from the wellhead.

[0052] Step S105: determining the specifications and models of the wellbore completion string, the depth, and the optimization of the location of the anti-wax and anti-scaling device;

[0053] For example, the wax content of crude oil in Well X1 is 28.6%, which is a high-wax oil well. As the daily liquid production gradually decreases, wax may form in the well section above the wax precipitation point. To facilitate the mechanical wax removal needs in the self-flowing production stage, conventional oil pipes are used in the well section above the wax precipitation point, with a depth of 400 to 500 meters. At the same time, considering the need to prevent eccentric wear of rods and pipes in the mechanical oil production stage, anti-eccentric wear oil pipes are installed in the well section below the wax precipitation point and above the pump hanging depth. Combined with the application conditions of the anti-wax and anti-scale device, its depth is 10 meters below the pump hanging depth.

[0054] Step S106: optimizing the combination of completion strings and checking their strength;

[0055] For example, by comparing and analyzing the feasibility of the completion strings of Scheme 3 and Scheme 4, according to the optimization result of step S105, the completion string matching of the two schemes is determined as follows:

[0056] Type 1: Φ60.3mm thickened oil pipe * 500m + Φ60.3mm thickened lined oil pipe * 1700m + Φ44mm oil well pump barrel + anti-wax and anti-scaling device * 2210m + Φ60.3mm flat oil pipe * 1290m

[0057] The second type: Φ73mm thickened oil pipe * 500m + Φ73mm thickened lined oil pipe * 1700m + Φ44mm oil pump barrel + anti-wax and anti-scaling device * 2210m + Φ60.3mm flat oil pipe * 1290m

[0058] At the same time, the strength of the pipe strings of the two schemes is analyzed using strength verification mathematical models or analysis software.

[0059] Step S107: Perform a one-time comparative analysis to optimally determine the completion string.

[0060] For example, if the strength checks of the first and second options both meet the production requirements, the one-time investment of the two options is compared and analyzed, and the completion string combination with lower investment is used as the completion string for well X1.

[0061] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. It will be apparent to those skilled in the art that various modifications to these embodiments are possible, and the general principles defined in the present application can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown in the present application, but will conform to the widest scope consistent with the principles and novel features applied for by the present application.

Claims

1. A self-flowing oil production integrated pipe string, characterized in that: include: An oil pipe (2), a sucker rod (1) is inserted into the interior of the oil pipe (2), a pumping pump (3) is provided at the lower end of the oil pipe (2), a wax and scale prevention device (4) is connected to the liquid inlet of the pump (3), and the lower end of the wax and scale prevention device (4) is connected to a bell mouth (5) via the oil pipe.

2. The self-flowing oil production integrated pipe string according to claim 1, characterized in that: The oil pipe (2) is a thickened oil pipe with set inner and outer diameters.

3. The self-flowing oil production integrated pipe string according to claim 1, characterized in that: The sucker rod (1) adopts a thickened inner lining oil pipe with set inner diameter and outer diameter.

4. The self-flowing oil production integrated pipe string according to claim 1, characterized in that: The combined shooting and extraction pump (3) adopts an oil pump barrel with a set outer diameter.

5. The self-flowing oil production integrated pipe string according to claim 1, characterized in that: The anti-wax and anti-scaling device (4) is an anti-wax and anti-scaling device with a set length and diameter.

6. The self-flowing oil production integrated pipe string according to claim 1, characterized in that: The oil pipe between the anti-wax and anti-scaling device (4) and the bell mouth (5) is a flat oil pipe with a set length and outer diameter.

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